When you ask "What number is halfway between 81 and 898?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=81 and Y=898.
To find the number halfway between 81 and 898, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 898 into our formula, we get:
(81 + 898)/2 = 489.5
Thus, the number halfway between 81 and 898 is 489.5.
To check that our answer is correct, we subtract 81 from 489.5 and subtract 489.5 from 898 and compare the two numbers:
489.5 - 81 = 408.5
898 - 489.5 = 408.5
As you can see, the halfway number is 408.5 higher than 81 and 408.5 lower than 898. Therefore, our halfway between answer of 489.5 above is correct.
Halfway Between
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Halfway Between 81 and 899
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